1 /* 2 * Copyright (c) 2017 Juniper Networks. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 13 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 14 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 16 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 17 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 18 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 19 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 20 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 21 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 22 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 23 * SUCH DAMAGE. 24 */ 25 26 /* 27 * Copyright 2018 Nexenta Systems, Inc. 28 */ 29 30 #define __STDC_WANT_LIB_EXT1__ 1 31 32 #include "lint.h" 33 34 #include <errno.h> 35 #include <stddef.h> 36 #include <stdint.h> 37 #include <string.h> 38 39 #include "libc.h" 40 41 /* __memset_vp is a volatile pointer to memset() function */ 42 static void *(*const volatile __memset_vp)(void *, int, size_t) = (memset); 43 44 /* ISO/IEC 9899:2011 K.3.7.4.1 */ 45 errno_t 46 memset_s(void *s, rsize_t smax, int c, rsize_t n) 47 { 48 errno_t ret; 49 rsize_t lim; 50 unsigned char v; 51 52 ret = EINVAL; 53 lim = n < smax ? n : smax; 54 v = (unsigned char)c; 55 if (s == NULL) { 56 __throw_constraint_handler_s("memset_s: s is NULL", ret); 57 } else if (smax > RSIZE_MAX) { 58 __throw_constraint_handler_s("memset_s: smax > RSIZE_MAX", 59 ret); 60 } else { 61 /* 62 * Both s and smax are valid, fill the memory buffer using 63 * memset() called through a volatile pointer to guarantee 64 * it will not be optimized away. 65 */ 66 (*__memset_vp)(s, v, lim); 67 68 if (n > RSIZE_MAX) { 69 __throw_constraint_handler_s("memset_s: n > RSIZE_MAX", 70 ret); 71 } else if (n > smax) { 72 __throw_constraint_handler_s("memset_s: n > smax", ret); 73 } else { 74 ret = 0; 75 } 76 } 77 return (ret); 78 } 79